/Engine/Source/Runtime/SlateCore/Public/Widgets/SWidget.h
Deprecated* GetRelativeLayoutScale(int32 ChildIndex, float LayoutScaleMultiplier), your widget will also need to set bHasRelativeLayoutScale in their Construct/ctor.
virtual float GetRelativeLayoutScale ( const [FSlotBase](API\Runtime\SlateCore\FSlotBase) & Child, float LayoutScaleMultiplier ) const